Abu Dawud Book 36, Hadith Number 4968.

Narated By Abdullah ibn Muhammad ibn al-Hanafiyyah : I and my father went to the house of my father-in-law from the Ansar to pay a sick visit to him. The time of prayer came. He said to someone of his relatives: O girl! bring me water for ablution so that I pray and get comfort. We objected to him for it. He said: I heard the Apostle of Allah (PBUH) say: Get up, Bilal, and give us comfort by the prayer.